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7 comments
Commentator

Join Date: May 2011
Posts: 73

6.6KV cable earthing

05/10/2012 1:24 PM

hello frnds...

Recently i have terminated 6.6KV cable from VCB breaker to 590KW 6.6KV HT motor, they asked me to connect the copper earth tail which comes from boot at end termination to body... they asked me to connect the earth tail at one end only leaving the other end. i asked why they told me tat to avoid circulating current... I cant understand please some one clear tis dought....

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Guru

Join Date: May 2010
Location: Liverpool, NY
Posts: 710
Good Answers: 83
#1

Re: 6.6KV cable earthing

05/10/2012 3:41 PM
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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain - possibly to become "South Scotland" or "Non-Caledonia" from September 2016. Kettle's on.
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#2

Re: 6.6KV cable earthing

05/11/2012 3:18 AM

It would be somewhere between 'foolhardy' and 'criminally negligent' to fail to follow the installation standards applicable to the country of installation.

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Guru

Join Date: Oct 2009
Posts: 2015
Good Answers: 163
#3

Re: 6.6KV cable earthing

05/11/2012 10:01 AM

Is it 3 singe-core cables or a three core cable?

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Commentator

Join Date: May 2011
Posts: 73
#4
In reply to #3

Re: 6.6KV cable earthing

05/13/2012 4:36 AM

sir, Its 3 core cables 6.6kv, the termination kit is raychem....

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Guru

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Posts: 2015
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#6
In reply to #4

Re: 6.6KV cable earthing

05/13/2012 10:35 AM

If it is a 3 core cable, there is no harm in earthing at both ends, as there would be no residual flux to induce any stray emf in the cable shield/armour and thus there would not be any circulating currents in the shield/armour, even if earthed at both ends.

Bonding the shield/armour at only one end is practised only for single core cables, that too if not laid in a trefoil formation. Regret to note that people follow/advise blind practices, without understanding the significance of the same.

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Commentator

Join Date: May 2011
Posts: 73
#7
In reply to #6

Re: 6.6KV cable earthing

05/13/2012 10:51 AM

Thank you sir or ur valuable answers, can u ellobrate this please..... why earthing is done at one end in single core cables as u told....???

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Commentator

Join Date: May 2012
Posts: 56
#5

Re: 6.6KV cable earthing

05/13/2012 4:44 AM

who the guys tell you that he don't know eletrical work so if your are electrical man you need to follow our international istandard, so you will not killed any one on that site just connect that earthing wire and you will be done and dont listen to that booliiii !!! earthing is the most important in our electrical installation remeber that !!!

hope he will help you this ,

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